When learning Chinese Pinyin, you shall be aware of certain limitations:

Pinyin does not represent English pronunciation and should not be pronounced according to English conventions. You are advised to learn Pinyin phonetic conventions, bearing in mind that many sounds have no equivalents in Englishss.

Since Pinyin is based only on the sounds of Mandarin Chinese, Pinyin is unsuitable for use for speakers of some other Chinese spoken dialects, because the sounds do not correspond to their speech.

The phonotactics of spoken Mandarin Chinese dictate a relatively small set of possible syllables and there is a potential for homonyms. Because of this, Pinyin can be ambiguous, especially when transcribing Standard Written Chinese, which uses formal constructions not often found in speech. However, this should not be an issue in the transcription of normal spoken Mandarin conversation since speakers would not use such ambiguous constructions in speech.

3. Or when you give people a present and thatt present is not something expensive or just a little thing, here means server as a token! example, wǒ mǎi le diǎn er shuǐ guǒ gěi tā ，jiù suàn yì sī yì sī (我买了点儿水果给他，就算意思意思): I bought some fruits for him, just serve as a token(Show my token).

4. Sometimes, yì sī shows a tendency or trend of something, for example, xiàn zài tiān qì yì tiān bǐ yì tiān liáng ，yǒu qiū tiān de yì sīle (现在天气一天比一天凉，有秋天的意思了。) : Now the weather is getting cooler and cooler, it seems autumn is coming. another example: wǒ kàn tā duì nà gè nǚ de yǒu yì sī (我看他对那个女的有意思): I think he fell in love with that girl.Now you may try to translate these sentences into Chinese with yì sī (意思) 1. What is the meaning of bù zài hu in Chinese? 2. Chinese is very interesting 3. This is to just show my token. 4. Do you really like that girl?